Вопрос № 911474 - Английский язык

What is the density of water?
Density (specific weight) is the amount of mass in a unit volume. It is measured in kilograms per cubic metre. The density of water is 1000 kg/m3 but most materials have a higher density and sink in water. Aluminium alloys, with typical densities around 2800 kg/m3 are considerably less dense than steels, which have typical densities around 7800 kg/m3. Density is important in any application where the material must not be heavy.
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What is the density of water?

Прочитайте текст и ответьте на вопрос:
What is the density of water?
Density (specific weight) is the amount of mass in a unit volume. It is measured in kilograms per cubic metre. The density of water is 1000 kg/m3 but most materials have a higher density and sink in water. Aluminium alloys, with typical densities around 2800 kg/m3 are considerably less dense than steels, which have typical densities around 7800 kg/m3. Density is important in any application where the material must not be heavy.

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Fatigue is the growth of cracks under stress. It occurs when a mechanical part is subjected to a repeated or cyclic stress such as vibration. Even when the maximum stress never exceeds the elastic limit, failure of the material can occur even after a short time. No deformation is seen during fatigue, but small localized cracks develop and propagate through the material until the remaining cross-sectional area cannot support the maximum stress of the cyclic force. Knowledge of tensile stress, elastic limits, and the resistance of materials to creep and fatigue are of basic importance in engineering.

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The combinations of two or more different materials are called composite materials. They usually have unique mechanical and physical properties because they combine the best properties of different materials. For example, a fibre-glass reinforced plastic combines the high strength of thin glass fibres with the ductility and chemical resistance of plastic. Nowadays composites are being used for structures such as bridges, boat-building etc.

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When you turn the handle of a water tap clockwise, the water stops. When you 1_______ it anticlockwise, the water pours out of the tap again. How does it work?
Look at FIG.2. The tap has a handle on the top and inside there is a 2_______, and a washer. The washer is over a hole.
When you turn the handle clockwise, this makes the bolt move downwards. The washer then covers the hole and stops the water.
When you turn the handle 3_______, the bolt moves upwards and the washer uncovers the hole again. This lets 4_______ flow through the tap again.

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As the population increases, the 1_______ of water supply in many desert regions becomes more urgent with every year.
Scientists 2_______ that the best way to solve this problem is to construct plants that will use atomic energy to distill fresh 3_______ from the sea. It is believed that it will be cheaper to distill sea water than to make 4_______ freshwater reservoirs.